From 45e256e24c976a55dc856907a57564cbc30cfb60 Mon Sep 17 00:00:00 2001 From: Kristof Provost Date: Wed, 29 Nov 2023 19:06:31 +0100 Subject: [PATCH] pf: remove incorrect fragmentation check We do not need to check PFDESC_IP_REAS while tracking TCP state. Moreover, this check incorrectly considers no-data packets (e.g. RST) to be in-window when this flag is not set. Sponsored by: Rubicon Communications, LLC ("Netgate") Approved by: so Security: FreeBSD-SA-23:17.pf (cherry picked from commit 6284d5f76d6bd2d97fe287c5adabf59c79688eda) (cherry picked from commit ee1d1e38fae65d045b113a7053651bbd7b780e1d) --- sys/netpfil/pf/pf.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index c9c0995cc4e..a52e29bf3e5 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -4563,8 +4563,7 @@ pf_tcp_track_full(struct pf_kstate **state, struct pfi_kkif *kif, (ackskew <= (MAXACKWINDOW << sws)) && /* Acking not more than one window forward */ ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo || - (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) || - (pd->flags & PFDESC_IP_REAS) == 0)) { + (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo))) { /* Require an exact/+1 sequence match on resets when possible */ if (dst->scrub || src->scrub) { -- 2.45.0